Related Experiment Video
Updated: Jul 14, 2026

Evaluating the Function of the Foot Core System in the Elderly
Published on: March 11, 2022
The flexible flatfoot in the adult
Eric Giza1, Gerard Cush, Lew C Schon
1Santa Monica Orthopaedic Group, 1313 20th Street, Suite 150, Santa Monica, CA 90404, USA. egiza@smog-ortho.net
Abstract:
The adult acquired flatfoot deformity is characterized by flattening of the medial longitudinal arch with insufficiency of the supporting posteromedial soft tissue structures of the ankle and hindfoot. While the etiology of this deformity can be arthritic or traumatic in nature, it is most commonly associated with posterior tibial tendon dysfunction (PTTD). By one estimate, PTTD affects approximately five million people in the United States. The clinical presentation of adult flatfoot can range from a flexible deformity with normal joint integrity to a rigid, arthritic foot.
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